79 lines
2.2 KiB
Elixir
79 lines
2.2 KiB
Elixir
defmodule Openflow.Action.NxOutputReg2 do
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import Bitwise
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defstruct(
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n_bits: 0,
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offset: 0,
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src_field: nil,
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max_len: :no_buffer
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)
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@experimenter 0x00002320
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@nxast 32
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alias __MODULE__
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alias Openflow.Action.Experimenter
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@type max_len :: :no_buffer | :max | non_neg_integer()
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@type t :: %NxOutputReg2{
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n_bits: pos_integer(),
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offset: non_neg_integer(),
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src_field: atom(),
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max_len: max_len()
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}
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@spec new(
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n_bits: pos_integer(),
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offset: non_neg_integer(),
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src_field: atom(),
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max_len: max_len()
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) :: t()
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def new(options) do
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src_field = options[:src_field] || raise "src_field must be specified"
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default_n_bits = Openflow.Match.Field.n_bits_of(src_field)
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%NxOutputReg2{
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n_bits: options[:n_bits] || default_n_bits,
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offset: options[:offset] || 0,
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src_field: src_field,
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max_len: options[:max_len] || :no_buffer
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}
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end
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def to_binary(%NxOutputReg2{} = output_reg) do
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src_field_bin = Openflow.Match.codec_header(output_reg.src_field)
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ofs_nbits = output_reg.offset <<< 6 ||| output_reg.n_bits - 1
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max_len = Openflow.Utils.get_enum(output_reg.max_len, :controller_max_len)
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padding =
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src_field_bin
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|> byte_size()
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|> Openflow.Utils.padding(10)
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Experimenter.pack_exp_header(<<
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@experimenter::32,
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@nxast::16,
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ofs_nbits::16,
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max_len::16,
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src_field_bin::bytes,
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0::size(padding)-unit(8)
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>>)
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end
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def read(<<@experimenter::32, @nxast::16, body::bytes>>) do
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<<ofs::10, n_bits::6, max_len::16, oxm_header::4-bytes, rest::bitstring>> = body
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exp_size = match_header_size(oxm_header) - 4
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<<experimenter_int::size(exp_size)-unit(8), _padding::bytes>> = rest
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src_field =
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Openflow.Match.codec_header(<<oxm_header::bytes, experimenter_int::size(exp_size)-unit(8)>>)
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max_len = Openflow.Utils.get_enum(max_len, :controller_max_len)
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%NxOutputReg2{n_bits: n_bits + 1, offset: ofs, src_field: src_field, max_len: max_len}
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end
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# private functions
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defp match_header_size(<<0xFFFF::16, _::bytes>>), do: 8
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defp match_header_size(<<_::16, _::bytes>>), do: 4
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end
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